Pipe cutting machine



. Sept. 8, 1 942.

J. NORTON 2,295,182

PIPE CUTTING MACHINE Filed Sept. 11, 1940 5 Sheets-Sheet 1 JZmQeS Nari '0 n- :sept. 8, 3942.

J. NORTON PIPE CUTTING MACHINE Filed Sept. 11, 1940 5 Sheets-Sheet 4 Se t. 8, 1942.

J. NORTON 2,295,182 PIPE CUTTING MACHINE Filed Sept. 11, 1940 5 Sheets-Sheet 5 37 1 Jhmafi fibril) 59 Patented Sept. 8, 1942 UNiTED STATES PATENT OFFECE PIPE CUTTING MACHINE James Norton, Tulsa, Okla.

Application September 11, 1940, Serial No. 356,400

13 Claims.

The present invention relates to improvements in pipe cutting machines and particularly to machines for cutting pipes of large diameter.

The primary object of the invention is to provide a pipe cutting machine which may be adjusted to suit requirements so that the pipe will be cut at the required angular relationship to the axis thereof.

A further object of the invention is to provide a pipe cutting machine in which an acetylene torch is presented to the work so that the torch may be adjusted to produce a straight edge out or a bevelled edge out on the end of the pipe which is being operated on.

A still further object of the invention is to provide a pipe cutting machine in which the pipe may be cut on any desired transverse plane to the axis of the pipe by changing the relationship between the movement of the cutting torchlongitudinally of the pipes axis and the speed of rotation of the pipe during the cutting operation.

A still further object of the invention is to provide a pipe cutting machine including an acetylene torch capable of being moved longitudinally of the pipe axis under the guidance of a cam templet.

A still further object of the invention is to provide a pipe cutting machine having adjustable supporting rollers which may be readily spaced apart to adapt the machine to pipes of various diameters.

A still further object of the invention is to provide a pipe cutting machine in which the speed of rotation imparted to the pipe may be substantially constant and the movement of the cutting torch may be varied by interchangeable gears interposed between the constant speed pipe rotating means and the acetylene cutting torch.

Other objects and advantages of the invention will become apparent during the course of the following description of the accompanying drawings, wherein,

Figure l is a detailed side elevational view illustrating one end of the machine embodying the invention for particularly illustrating the pipe supporting cradle;

Figure 1a is a side elevational view and a continuation in part of Figure 1, showing the opposite end of the machine including the gear housing and templet cam;

Figure 2 is a top plan view of one end of the pipe cutting machine, further illustrating the adjustable pipe supporting cradle and the manner in which the acetylene torch is presented to the work;

Figure 2a is a top plan view illustrating the opposite end of the machine and specifically showing the templet and its arrangement which is adaptable to operate the acetylene torch slide bar;

Figure 3 is a longitudinal cross-sectional view illustrating in detail the arrangement of the interchangeable gears for imparting various driving speeds to the torch operating slide arm;

Figure 4 is a horizontal cross-sectional view taken on line 44 of Figure 3, looking in the direction of the arrows, further illustrating a speed change gearing between the cylinder operating drive means and the torch operating slide rod;

Figure 5 is an enlarged transverse cross-sectional detail view of the pipe supporting cradle illustrating the adjustable drive rollers and their interchangeable relationship with the drive means;

Figure 6 is a vertical cross-sectional view taken on line 66 of Figure 3, looking in the direction of the arrows, further illustrating the change speed gearing interposed between the cylindrical pipe and torch operating slide bar;

Figure '7 is an enlarged top elevational view of the acetylene torch supporting bracket and slide guide;

Figure 8 is a vertical cross-sectional view taken on line 8-8 of Figure 3, looking in the direction of the arrows, illustrating the interchangeable gear shifting lever associated therewith;

Figure 9 is a transverse vertical cross-sectional view taken on line 9-9 of Figure 1, looking in the direction of the arrows, illustrating in detail the construction of the torch supporting bracket and slide guide;

Figure 10 is a transverse cross-sectional view taken on line Ill-IQ of Figure 1, looking in the direction of the arrows, illustrating in detail the construction of the torch supporting arm and clamping means;

Figure 11 is a staggered cross-sectional view taken on line H-ll of Figure 9, looking in the direction of the arrows, further illustrating the torch supporting bracket and slide guide for supporting the same;

Figure 12 is a vertical enlarged fragmentary cross-sectional view of the slide guide illustrating a locking clamp carried thereby for connection with the torch operating slide bar;

Figure 13 is a cross-sectional view greatly enlarged taken at right angles to Figure 12, further illustrating the locking connection between the .a plunger 45.

slide guide and the acetylene torch operating slide bar; and

Figure 14 is a longitudinal cross-sectional view taken on line |4|4 of Figure 9, looking in the direction of the arrows, illustrating in detail the construction of the acetylene torch clamping and holding means.

In the drawings, wherein for the purpose of illustrating the invention and wherein like reference characters will be employed to designate like parts throughout the same, the reference character I6 will generally be employed to designate a base member formed of an angle bar having vertical and horizontal flanges II and I2.

Adjacent the ends of the angle bar If! and connected to the vertical flange II thereof are angle bar uprights I3 and I4. The angle bar uprights I3 and I4 may be welded in place or fastened by other suitable means.

Also secured to one end of the angle bar I8 is a cradle frame I5 including parallel side frame bars I6 connected at the ends by transverse cross bars I1 and I8. The cross bar I8 is welded to the vertical flange II of the angle bar base and the cradle supporting frame extends laterally therefrom.

A series of oppositely disposed notches I9 are formed in the parallel side frame members I6 and are adapted to receive a spindle 28 carrying adjacent its ends pipe supporting rollers 2|. Similarly, an axle shaft 22 is supported in a pair of oppositely disposed notches formed in the parallel side frame members I6 and said axle shaft is provided with pipe supporting rollers 23 in radial alignment with the supporting rollers 2| whereby a piece of work such as a pipe P may be supported on the rollers so that the same may be rotated about its axis.

Rigidly secured to the axle shaft 26 is a gear wheel 24 and likewise, a gear wheel 25 is rigidly secured to the axle shaft 22. The gear wheels 24 and 25- are adapted to mesh with a rotating screw shaft 26 having one end rotatably journaled in a bearing 21 carried by the transverse frame member II while the opposite end is swiveled in a bearing 28 carried by the opposite transverse end wall I8. The screw threaded shaft 26 projects beyond the base member I!) and is provided with a crank arm 29 having a crank handle 36 whereby rotation of the screw threaded shaft 26 and the pipe supporting rollers 2| and 23 may be accomplished.

The work or pipe P is adapted to be held in place upon the supporting rollers 2| and 23 by means of a link chain including a series of link sections 3| joined and pivoted as at 32 by pivot pins. Mounted on the pivot pins and between the link sections 3| are a series of rollers 33 which engage the periphery of the work or'pipe P as shown in'Fi'gure 5.

.A hook 34 is formed on the transverse frame bar I8 and is adapted 'to receive'one of the pivot pins 32 whereby said pipe engaging chain may swing transversely to the work about the axis of one of the pins 32 so that the free end may be resiliently anchored to the transverse cradle frame member H. To accomplish such a resilient connection, a dash pot 35 is connected to a lug 36 on the transverse cradle frame member I I by means of a loop 3? and said dash pct 35 is closed atone end as at 38 and is provided with a plunger 39 mounted on the extreme inner end of The plunger 46 is provided with a pivoted lever 4| connected thereto as at 42 and said pivoted lever 4| is provided with an extension 43 for connection with the free swinging ends of the chain 3| by mean of parallel links 44 connected to one of the pivot pins 32 and to the extension 43 by means of a pivot pin 45.

Swinging movement of the operating lever 4| will cause the compression of a coil spring 46 and the resultant locking of the hand lever 4| in an off-center position by reason of the extension 43.

Mounted in the upper ends of the angle bar uprights I3 and I4 is a pair of parallel spaced rods 41 and 48, the ends of which are welded or otherwise fastened in place adjacent the extreme ends of the vertical uprights I3 and I4.

Slidably mounted on the parallel rods 41 and 48 is a housing 56 having a pair of spaced rollers 52 mounted in one vertical wall thereof while on the opposite wall there is provided a pair of rollers 53 which engage the lower guide rod 48. Mounted in the upper portion of the slide guide 5|] is a pair of grooved rollers 54 which straddle the upper guide rod 41 and are held in place by pins 55 extending through the vertical side walls of the slide guide.

Formed integral with the slide guide is a bracket arm 56 for receiving a tubular bolt 5'! having a threaded portion 58 which extends through an aperture in the bracket arm 56 and is held in place by means of a nut 53 threaded on the screw threaded portion 58.

Extending through the tubular nut is a shaft 68 on one end of which is formed a clamping bracket 6! having a transverse bore 62 terminating in a bifurcated portion as at 63. A thumb bolt 64 extends through the bifurcations 63 so that the bore 62 may adjustably hold a tubular arm 65 having a flanged portion 66 which is adapted to engage a similarly shaped flange portion 67 on the bracket 6|.

Formed on the tubular nut 57 is a projection 68 which is adapted to engage a latch plate 69 held in place by means of a screw I6, anchored in the bracket 6|. It will thus be seen that the bracket 6| may be rotated on the spindle to the desired position and then held in place by tightening the nut II on the threaded end of the spindle 66. The projection 68 may be moved to the desired position so that the arm will be locked against downward movement.

The free end of the arm 65 is provided with an angular collar I3 having an angularly extending passageway I4 for receiving a blow torch of the acetylene type. Longitudinally extending through the tubular arm 65 is a rod having one end projecting into the angular collar 14 so that a bearin plate I6 may engage the acetylene torch and hold it in position. The bearing plate I6 is angularly disposed on the end of the rod I5 and is provided at each end with downwardly extending aprons I7 and I8 which are provided with inwardly turned portions I9 and to engage under the angularly shape-d collar I3 and prevent displacement of the bearing plate 16.

Threaded in the opposite end of the tubular arm 65 is a bolt 8|, the end of which is adapted to engage the lower end of the rod I5 for moving the same toward one end of the tubular arm 65 causing a clampin engagement between the clamping plate and the acetylene torch.

Slidably mounted in the vertical uprights I3 and I4 between the slide rods 4! and 48 is a bar 82 which extends through the slide guide 50 and is adapted to be anchored thereto by means of a yoke 83 extending therearound and said yoke is provided with a relatively flattened portion 84 to which is rigidly secured a screw threaded bolt 85. The flattened portion 84 of the yoke extends through a slot 86 formed in one side wall of the slide guide 59 so that a clamping plate 81 may be positioned on the bolt 85 so that the legs 88 at each end thereof may engage the side wall of the slide guide 58. A nut 89 is threaded on the bolt 85 to cause the legs 88 to exert a pressure on the side wall of the slide guid and at the same time exert a pull on the yoke 83 so that the rod 82 will be locked in position on the slide rod 82.

Formed at one end of the machine is a gear housing 99 braced from the vertical angle bar standard I4 by means of a horizontal bar 9!. The slide rod 82 extends through a bearing 92 secured to the horizontal brace bar 9| and is adapted to carry a pulley 93 over which is trained a cable 94 having attached to one end thereof a weight 95. The opposite end of the cable is secured to a collar 98 attached to the slide rod 82 and said cable is anchored in place as at 91. The extreme free end of the slide rod 82 is bifurcated as at 98 for receiving a roller 99 pivotally mounted between the furcations by means of a pin I88.

The gear casing 98 is secured to one end of the angle base member I8 and extends laterally therefrom. The gear casing comprises side walls I8| connected by a rear wall I92 and a front wall I83, The top wall is slightly curved as at I84 and extending upwardly therefrom is a curved housing I85 connected thereto by a relatively straight portion I86 and having the opposite end connected to the rear wall I92 by means of a relatively straight portion I81.

A housing I88 is formed in the front wall I83 and includes a side wall I89 extending forwardly from the gear casing wall I8I and in opposition to the side wall I89 there is provided a side wall I I8 extending forwardly from the end wall of the gear casing I83. The casing I88 is closed at one end by a wall II I and is provided with a bottom wall I I2.

Extending into the casing I88 is a shaft II3 rotatably mounted in the vertical standards I3 and I4 by suitable bearing collars I I4 and H5. The shaft II3 extends into the casing I88 and is provided therein with bearings H8 and H1, on the walls of the casing I I I and I83.

The opposite end of the shaft H3 is provided with a worm gear II8 adapted to mesh with the screw threaded rod 29 so that when rotation is imparted to the screw threaded rod 28, the shaft II3 will be likewise rotated. The opposite end of the shaft H3 is provided with change speed gears H9, I28 and I2I which are rigidly secured to the shaft I I3 to turn therewith.

Slidably mounted in the casing 99 longitudinally thereof is a shaft I22 having the ends slidably mounted in bearings I23 and I29 and it will be noted that the bearing I24 is carried by the end wall I82 while the slide bearing I23 is carried by the front wall of the casing I I I. A slide bearing I25 further supports the slide rod I22 and is carried by the end wall of the casing I83. The ends of the shaft I22 project through the walls I82 and III a considerable distance to allow longitudinal sliding movements of said shaft I22 for the purpose of causing gear wheels I26, I21 and I28 to be brought into mesh selectively with the gear Wheels II9, I28 and IZI. It will be noted that when the slide shaft I22 is moved to its extreme left position, the gear wheel II9 will mesh with the gear wheel I23 thereby causing the slide shaft I22 to be rotated slower than the shaft I I3.

When the gear wheel I2I is in mesh with the gear wheel I28 when the slide rod I22 is shifted to its extreme right hand position, the rotation of the shaft I22 will be much faster than when in mesh with the gear II9. When the gear wheels I28 and I21 are in mesh, there is a direct drive between the shafts I I3 and I22.

Mounted on one end of the shaft I22 is a collar I29 which is adapted to be engaged by a forked arm I38 at the lower end as at I3I. The forked arm I38 is provided with a shaft I32 supported by a bracket I33 having an angle portion I34 welded or otherwise secured to the rear wall I92 of the casing. The opposite end of the shaft I32 projects through an opening I35 formed in the side wall I8I and is provided with a crank arm I38 on the free end of which is provided an operating handle I31. The crank arm I36 is provided with a projection for being received in apertures I38 formed in the path of the arc inscribed by the crank arm I35 so that the sliding shaft I22 may be held in one of three positions corresponding to the desired drive effected by the gear wheel H9, I29 and I2I meshing with the gear wheels I26, I21, and I28.

Slidably mounted on the shaft I22 is a yoke I39 between the arms of which is located a gear Wheel I48 slidably keyed to the shaft I22. The yoke I39 is provided with an extension lug I4I having an aperture for receiving a link I42, one end of which is bent as at I83 so that it may extend through the aperture in the lug MI and be held in place by a cotter key I44. The opposite end of the link I92 is provided with an offset portion I95 adapted to be received in a crank arm I99 in the offset portion thereof as at I41. The crank arm I46 is formed on the end of a rotary shaft I58 which is journalled in the side wall I8I of the casing and is further supported by a bracket I49, the legs of which as at I58 are anchored to the side wall of the casing I8I by angular feet I5I.

The free end of the shaft I48 is provided with a crank arm I52 on the end of which is formed a handle I53 so that the crank arm I52 may be brought into registry between projections I54 formed on the side wall of the casing I8I thereby sliding the gear I48 along the shaft I22.

Pivotally mounted on the shaft I22 for Sliding movement relative thereto is an operating lever I55 having a handle I55 which is adapted to project through a series of openings in the top curved wall I94 of the casing 98. The lower end of the operating lever I55 is provided with spaced arms I51 which straddle the gear I98 and are mounted between the arms of the yoke I39 whereby sliding movement of the yoke I39 will likewise cause longitudinal sliding movement of the operating lever I 55.

Pivotally mounted between the arms I51 is a gear wheel I58 suitably mounted on a stud I59 so that said gear wheel will constantly be in mesh with the gear wheel I49. The intermediate portion of the operating lever I55 is slightly curved as at I88 so that the operating lever handle will extend angularly and upwardly away from the casing 98. The top wall of the casing I94 is provided with an opening I8! and the edge of the top wall I 94 is stepped as at I 82 so that the operating handle may move longitudinally in the slot IfiI and then may be moved toward one of the stepped portions I52 so that a latch I83 carried by the handle I58 and pivoted thereto as at I54 may have its end I85 engage any one of a series of projecting teeth 186 formed, adjacent the wheel I58 carried between the spaced arms I51 of the operating handle I55. As the gear I58 is slid longitudinally with respect to the gear wheels I until the desired position opposite one of the gear wheels I10 is located, the operating lever I is shifted forwardly in the opening IBI so that it will engage the corresponding step I 62 and the latch lever dog I will engage the corresponding tooth I56. In this position, the selective rotative drive of the shaft I61 is acquired and the spaced arms I51 are moved along the shaft I22 by the crank arm I52.

Secured within the casing to the end wall I02 is a bracket I1I having a bearing I12 in which is rotatably mounted a shaft I13. On each end of the shaft I13 there is provided bevel gear wheels I14 and I 15 and the gear wheel I15 is adapted to mesh with a correspondingly shaped ,bevel gear I16 rigidly attached to the rotary shaft I61.

The bevel gear H4 is adapted to mesh with a correspondingly shaped bevel gear I18 rigidly secured to a transverse shaft I19 journalled in the side walls of the housing I05. The shaft I19 projects through the housing I05 and the end thereof is threaded as at I for receiving a nut vISI. A spacing collar I82 is located on the shaft I19 so that a cam templet I83 may be attached to the shaft I19 and held in place by the nut I8I.

The cam templet I83 is adapted to engage the roller 99 carried by the end of the slide rod 82 whereby rotation of the cam templet I83 will cause a corresponding sliding movement to be imparted to the slide rod 82.

The templet I83 is interchangeable and may be removed so that a slightly different shaped templet may be positioned on the shaft I19 to cause various irregular movements to be imparted to the slide rod 82 and slide guide 50.

When an acetylene torch T is positioned on the end of the tubular arm 65 as shown in Figs. 1 and 2, the end of the torch T will be presented to the pipe P so that as the pipe is rotated by turning the hand crank 29, the torch Twill be moved longitudinally in accordance with the shape of the templet I83 to produce a cut in the work P in accordance with the rotative speed of the work with relation to the sliding movement of the slide guide 50.

It will thus be seen that the operating handle I56 may be adjusted to bring the gear I40 into mesh with one of the gears I10 so that the relationship between the shafts II 3 and I19 will be such as to produce the required speed of movement therebetween in order to produce transverse cuts on the pipe of a number of different degrees in angularity with respect to the axis of the pipe.

The gearing may be setso that the cam templet will make a complete revolution before a quarter of a revolution has been imparted to the pipe so that circular, oblong or other shaped openings may be formed in the pipe to produce joints in a much more easy manner than have heretofore been attained.

Likewise, the shaft I19 may be rotated so slow with respect to the rotation of the shaft H3 that the torch T will cut a scollop in the end.'0f

the pipe-or may transversely cut the pipe 'angularly with respect to the axis thereof on 'a number of different degree angles.

It is to be understood that the form of themvention herewith shown and described is to betaken as the preferred embodiment of thesame and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention .or the scope of the sub-joined claims.

I claim:

1. A pipe cutting machine comprisinga cradle for the pipe, means for rotating the pipe, a.cutting torch slidably mounted longitudinally of'the axis of the pipe means for reciprocating the torch and interchangeable gearing interposedbetween the pipe rotating means and torch reciprocating :means for varying the speed of the torch, whereby said torch maybe causedto move in reverse directionsduring a rotation of the pipe.

2. A pipe cutting machine comprising acradle for the pipe, means for rotating'the pipe,:a cutting torch slidable relative to the longitudinal axis of the pipe means for reciprocating the torch and interchangeable gearing for varying the speed between the pipe rotating means and reciprocatory speed of the cutting torch, whereby said torch may traverse the longitudinal axis of the pipe in more than two directions during a rotation of the pipe.

3. A pipe cutting machine comprising a base frame, a pipe cradle carried at one end of the frame, means for rotating the pipe in the (cradle, a cutting torch slidably carried by the base frame means for reciprocating the torch and interchangeable gearing means connecting .the pipe rotating means and torch reciprocating means, whereby the cutting torch may move longitudinally of the axis of the pipe, in more than two directions during a 180 rotation of the pipe.

4. A pipe cutting machine comprising a base frame, a cradle mounted at one end of the :frame for supporting a pipe, drive means associated with the cradle for rotating the pipe, a cutting torch slidably carried by the base frame and :interchangeable drive means connecting the pipe rotating drive means with the torch operating means, whereby the relative speeds .therebetween may cause the torch to traverse the longitudinal axis of the pipe in more than two directions during a 180 rotation thereof.

5. A pipe cutting machine comprising a base frame, a cradle mounted at one end of the frame for supporting a pipe, rollers carried by the cradle for rotating the pipe, 2. cutting torch slidably carried by the frame adapted to move longitudinally of the pipe and interchangeable gearing interposed between the rollers and the cutting torch, whereby the speed of the torch travel may be varied without altering the stroke thereof.

'7. A pipe cutting machine comprising a base frame, a cradle mounted at one end of the base frame, rollers for engaging and rotating the pipe, a drive shaft for said rollers, a gear housing located at the opposite end of the base frame, a guide-way supported by the base frame, a cutting torch slidably carried by the guide-way, means operable from the gear housing for reciprocating the cutting torch and interchangeable gearing interposed between the roller drive shaft and the torch reciprocating means.

8. A pipe cutting machine comprising a base frame, a cradle located at one end of the base frame, rollers carried by the base frame for engaging and rotating a pipe, a drive shaft for the rollers, a guide-way mounted on the base frame, a cutting torch slidably carried by the guideway, a gear housing located on the opposite end of the base frame, gearing carried by the housing, means operable by the gearing for reciprocating the cutting torch longitudinally of the pipe axis and a shaft connecting the gearing with the roller drive shaft.

9. A pipe cutting machine comprising a base frame, a cradle mounted at one end of the frame, for rotatably supporting a pipe, a cable surrounding the pipe, ro1lers carried by the cable for engaging the periphery of the pipe, a pair of slide bars supported by the base frame, a slide guide mounted on the slide bars, a bracket secured to the slide guide, an adjustable torch support carried by the bracket, means for rotating the pipe and variable means for reciprocating the slide guide, whereby the cut generated may extend angularly in more than two directions during a 180 rotation of the pipe.

10. A pipe cutting machine comprising a base frame, a cradle mounted at one end of the base frame for rotatably supporting a pipe, a link chain surrounding the pipe and connected to the cradle for holding the pipe in place, rollers carried by the link chain for engaging the periphcry of the pipe, a pair of slide bars supported by the base frame extending parallel with the pipe, a slide guide mounted on the slide bars, an adjustable bracket carried by the slide guide, a torch supported by the adjustable bracket, a reciprocating bar mounted between the slide bars connected to the slide guide, a roller on one end of the reciprocating bar, a cam templet adapted to reciprocate the reciprocating bar, means for rotating the pipe and means for rotating the templet at different speeds.

11. A pipe cutting machine comprising a base frame, a cradle mounted at one end of the base frame for rotatably supporting a pipe, adjustable rollers carried by the cradle, a screw threaded drive shaft for rotating the rollers, a pair of slide bars supported above the base frame, a slide guide carried by the slide bars, an adjustable bracket supported by the slide guide, a torch mounted on the free end of the adjustable bracket having its ends presented to the pipe, a reciprocating rod secured to the slide guide, a rotary templet cam for reciprocating the reciprocating bar, a drive shaft connected with the screw threaded drive rod for rotating the templet cam and interchangeable gearing interposed between the drive shaft and the rotary templet cam.

12. A pipe cutting machine comprising an elongate base frame, a pipe cradle mounted at one end of the frame, rollers carried by the cradle for supporting a piece of pipe, a drive shaft having screw threads for rotating the rollers, a pair of vertical uprights secured to the base frame, a pair of guide bars supported adjacent the upper ends of the vertical uprights, a bracket slidably mounted on the guide rods, an acetylene torch adjustably carried by the bracket, a reciprocating rod connecting the bracket, a cam templet engaging one end of the rod for imparting reciprocating motion thereto, means for rotating the screw threaded rod to impart rotation to the pipe and an interchangeable gear set interposed between the screw threaded drive rod and the cam templet.

13. A pipe cutting machine comprising an elongated base frame, a pipe supporting cradle at one end of the base frame, adjustably mounted rollers carried by the cradle for rotatably supporting a pipe, a screw threaded shaft for rotating the rollers, a hand crank mounted on the screw threaded shaft for manually driving rollers, a pair of slide bars carried by the base frame, a slide mounted on the slide bars, an adjustable bracket attached to the slide, an acetylene torch carried by the adjustable bracket, a slide rod attached to the slide, a cam templet adapted to engage the end of the slide rod for imparting reciprocating movement thereto, a gear housing located at the opposite end of the base frame, interchangeable gearing located in said housing adapted to drive said templet, and a longitudinal shaft adapted to be rotated by the screw threaded shaft for driving the interchangeable gearing.

JAMES NORTON. 

